Definition: You are given a question on econometrics. Econometrics is the application of statistical methods to economic data in order to give empirical content to economic relationships. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: What would be then consequences for the OLS estimator if heteroscedasticity is present in a regression model but ignored?
(A)It will be biased (B)It will be inconsistent (C)It will be inefficient (D)All of (a), (b) and (c) will be true.

C